[201] How to Calculate Startup Resistor / Resistance to Design SMPS Switch Mode Power Supply

in this video i discussed How to Calculate Startup Resistor or startup Resistance or bootstrap resistor or VCC resistor or Rstartup. video language is Urdu / Hindi Language
to Design SMPS Switch Mode Power Supply. it is useful for calculation to design switch mode power supply (SMPS) for current mode controller using UC3842, uc3843, uc3844, uc3845 or KA3845 or KA3842 or KA3843 or KA3844
or any current mode smps which uses external mosfet to give a UVLO upper limit threshold charging at vcc capacitor. it provides a limited current of 0.5mA to 1mA to charge hold-up capacitor, when ic monitors that the voltage are at UVLO-ON threshold, then the IC takes soft start to drive transformer, so we take output at secondary and vcc / auxiliary / bias winding, which further provides operating current to the ic at 17mA

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[@fastearningmoney2520]

Sir ye smps me output current (A) kaise set hota hai aur ham uso kaise bathaye ghataye plz uske bareme video banaiya plz i like your videos

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[@haseebelectronicsurdu]

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Glad it was helpful!

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Jazaak Allah dear brother

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[@kitchentoolss]

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[@haseebelectronicsurdu]

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[@Rajudas11985]

@@haseebelectronicsurdu Thank you sir

[@KapilKumar-mm3nc]

Thank you sir Please explain MOSFET kaa gate sa drive res.33 ome ka parele maa diode laga hota .?why and res . ground bhi haa Please sir explain Thanks

[@powerelectronics8568]

Video kay end main ic ke supply ziner k bary mein apny nhi btya Next video mein or uc3843 ic ke or mosfet protection Kaisy karskty hain

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[@ajitmohanty1684]

thank you sir for the wonderful explanation, i have some doubts. can you please reply 1. I have calculated the resistor as you taught and applied it to the circuit, I found the PD between the -ve end of the capacitor and the endpoint of the resistor is 260v(approx). is it correct? 2. please guide me on how will I choose the capacitor.

[@sartajkhan7512]

Assalam vale kum

[@haseebelectronicsurdu]

thanks a lot

[@SajjadAli-yd6dz]

Sir g . kya ham aek 12v 9amp ko barha kar 12v 15amp kar saktein hein . ya phir 12v ki smps ki takat zeyada ho jae.

[@satbiryadav4292]

Sir g good morning sir mujhe serket daygram chahiye kaha melega SMPS charge ka

[@udalkumar1400]

Will you explain the all calculation of components used in particular smps supply

[@haseebelectronicsurdu]

sure i will try my best to do it as soon as possible

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[@haseebelectronicsurdu]

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[@littlegeniusplayschool459]

Hi, I am finding that ic like top256yn does not need startup resistor. Drain pin itself function for soft start. Am I correct?

[@jacket7242]

Sir, calculated value of resistor aur practically used value of resistor me itna antar kyo aa raha... ? Agar 220 k, 1 W ka resistor bhi lagaya to vah over current se heatup hokar burn out ho jaayega.. .. pl. Explain in detail please...

[@abidsaleem5070]

Asalamuallekom sir mera sawal ha k agar koi bhi smps ma mosfet kharab ho os ma mosfet ko jo pwm se jo signal arahe ha os kayse check keya jata ha or os ko check karny k leye ken cheezoon k zarorat ha koi asan hal batayeen

[@cravi7563]

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[@bhupeshkumar9070]

Janaab ho sake to components ki Basic knowledge dete to maza aa jaye

[@haseebelectronicsurdu]

yes sure i will do that

[@silenceseeker3544]

Hello sir , I couldn't find the continuous part after this video. Could you please help to locate it ?

[@vctech4954]

Sir sg3524 ic ka start-up resistor kya hoga jiske dc voltage 150 to 320 voltage h please resistor or capacitor ki value bta de please

[@haseebelectronicsurdu]

oaky dear i will try to discuss it soon

[@electronicspracticalgyan2936]

Sir on 0M0380R STR,3rd pin is Vcc.Vcc voltage is fluctuating 10v/13/16/19/22.not stable.What is the fault??

[@haseebelectronicsurdu]

there is something short circuit in secondary side, check some diode, capacitor, open connection, or check vcc capacitor

[@coloradowilderness3139]

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Sir mosfet RDS keyahe

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A. O. A sir kya haal hai sir 12 volt 15 amp smps ka transformer bna den ek sir mainy kafi br kaha hai plzz sir

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Sir मेंरेको डीसी कोभेटर बनाने का काम करना है जो 48 से 12 बनाने का है 3845 का आइसी है

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[@soothingsouls204]

Bro apne calculation kese ki?

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turkish subtitle please...!!! ✋

[@soothingsouls204]

0.5*10-3 kese kia

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سلام سر یہ جو کمپیوٹر کی پاور سپلائی ہوتی ہے 80 پلس گولڈ سلور پلاٹینم وغیرہ یہ کیا بلا ہے اور ان کی قیمت بھی ڈبل ہوتی ہے کیا ان پر زیادہ پیسہ خرچ کرنا ٹھیک ہے یاں عام سادہ پاور سپلائی لینی چاہیئے ہو سکے تو اس پر ایک تفصیلی ویڈیو بنائیں۔ جزاک اللہ

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English please Brother ..

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[@sushilchoudhary5749]

Excellent. Thanks for informative video.